diff --git a/doorip-api/src/main/java/org/doorip/common/Constants.java b/doorip-api/src/main/java/org/doorip/common/Constants.java
index cb50cbc..3123a06 100644
--- a/doorip-api/src/main/java/org/doorip/common/Constants.java
+++ b/doorip-api/src/main/java/org/doorip/common/Constants.java
@@ -16,4 +16,5 @@ public abstract class Constants {
     public static final int MIN_STYLE_RATE = 0;
     public static final int MAX_STYLE_RATE = 100;
     public static final int PROPENSITY_WEIGHT = 25;
+    public static final int MAX_PARTICIPANT_COUNT = 6;
 }
diff --git a/doorip-api/src/main/java/org/doorip/trip/api/TripApi.java b/doorip-api/src/main/java/org/doorip/trip/api/TripApi.java
index ea7465c..b8b0aac 100644
--- a/doorip-api/src/main/java/org/doorip/trip/api/TripApi.java
+++ b/doorip-api/src/main/java/org/doorip/trip/api/TripApi.java
@@ -105,7 +105,7 @@ ResponseEntity<BaseResponse<?>> getTrips(@Parameter(hidden = true)
                                              @RequestParam final String progress);
 
     @Operation(
-            summary = "초대 코드 검증 API",
+            summary = "초대코드 검증 API",
             responses = {
                     @ApiResponse(
                             responseCode = "200",
@@ -114,6 +114,10 @@ ResponseEntity<BaseResponse<?>> getTrips(@Parameter(hidden = true)
                             responseCode = "400",
                             description = "잘못된 요청입니다.",
                             content = @Content),
+                    @ApiResponse(
+                            responseCode = "400",
+                            description = "여행에 입장할 수 있는 최대 인원은 6명입니다.",
+                            content = @Content),
                     @ApiResponse(
                             responseCode = "401",
                             description = "액세스 토큰의 형식이 올바르지 않습니다. Bearer 타입을 확인해 주세요.",
diff --git a/doorip-api/src/main/java/org/doorip/trip/service/TripService.java b/doorip-api/src/main/java/org/doorip/trip/service/TripService.java
index f54e25d..a4108b9 100644
--- a/doorip-api/src/main/java/org/doorip/trip/service/TripService.java
+++ b/doorip-api/src/main/java/org/doorip/trip/service/TripService.java
@@ -43,7 +43,6 @@ public TripCreateResponse createTripAndParticipant(Long userId, TripCreateReques
         Trip trip = createTrip(request, code);
         createParticipant(request, findUser, trip);
         tripRepository.save(trip);
-
         return TripCreateResponse.of(trip);
     }
 
@@ -53,7 +52,6 @@ public TripEntryResponse entryTrip(Long userId, Long tripId, TripEntryRequest re
         Trip findTrip = getTrip(tripId);
         validateDuplicateParticipant(findUser, findTrip);
         createAndSaveParticipant(request, findUser, findTrip);
-
         return TripEntryResponse.of(findTrip);
     }
 
@@ -65,9 +63,17 @@ public TripGetResponse getTrips(Long userId, String progress) {
 
     public TripResponse verifyCode(TripVerifyRequest request) {
         Trip trip = getTrip(request.code());
+        List<Participant> participants = trip.getParticipants();
+        validateParticipantCount(participants);
         return TripResponse.of(trip);
     }
 
+    private void validateParticipantCount(List<Participant> participants) {
+        if (participants.size() == Constants.MAX_PARTICIPANT_COUNT) {
+            throw new InvalidValueException(ErrorMessage.INVALID_PARTICIPANT_COUNT);
+        }
+    }
+
     private void validateDate(LocalDate startDate, LocalDate endDate) {
         if (endDate.isBefore(LocalDate.now()) || endDate.isBefore(startDate)) {
             throw new InvalidValueException(ErrorMessage.INVALID_DATE_TYPE);
@@ -80,7 +86,6 @@ private String createCode() {
             String uuid = UUID.randomUUID().toString();
             code = uuid.substring(0, 6);
         } while (isDuplicateCode(code));
-
         return code;
     }
 
diff --git a/doorip-common/src/main/java/org/doorip/message/ErrorMessage.java b/doorip-common/src/main/java/org/doorip/message/ErrorMessage.java
index fc10503..5ceb06b 100644
--- a/doorip-common/src/main/java/org/doorip/message/ErrorMessage.java
+++ b/doorip-common/src/main/java/org/doorip/message/ErrorMessage.java
@@ -17,6 +17,7 @@ public enum ErrorMessage {
     INVALID_ALLOCATOR_COUNT(HttpStatus.BAD_REQUEST, "e4003", "여행 TODO를 생성하기 위해 최소 1명 이상의 배정자가 필요합니다."),
     INVALID_DATE_TYPE(HttpStatus.BAD_REQUEST, "e4004", "유효하지 않은 날짜 타입입니다."),
     INVALID_RESULT_TYPE(HttpStatus.BAD_REQUEST, "e4004", "유효하지 않은 성향 입력 값입니다."),
+    INVALID_PARTICIPANT_COUNT(HttpStatus.BAD_REQUEST, "e4005", "여행에 입장할 수 있는 최대 인원은 6명입니다."),
 
     /**
      * 401 Unauthorized